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Port 2498 (odn-castraq)

IANA assigns port 2498 to odn-castraq: ODN-CasTraq.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
odn-castraq TCP ODN-CasTraq Richard Hodges 2 -
odn-castraq UDP ODN-CasTraq Richard Hodges 2 -

Check what is listening on port 2498

Linux: is anything listening on TCP 2498?
sudo ss -tlnp 'sport = :2498'
Linux: UDP 2498
sudo ss -ulnp 'sport = :2498'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2498
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2498 '
Windows (Command Prompt)
netstat -ano | findstr :2498
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2498 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2498
From Windows
Test-NetConnection HOST -Port 2498
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2498

Block port 2498 in the firewall

ufw
sudo ufw deny 2498/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2498 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2498 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2498' -Direction Inbound -Protocol TCP -LocalPort 2498 -Action Block
ufw
sudo ufw deny 2498/udp
iptables
sudo iptables -A INPUT -p udp --dport 2498 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2498 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2498' -Direction Inbound -Protocol UDP -LocalPort 2498 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.